Receiver for pneumatic card strippers and the like



MM, 1950 c. E. WHITE ET AL 2,505,873

RECEIVER FOR PNEUMATIC CARD STRIPPERS AND THE LIKE Filed Jan. 51, 1948 4 Sheets-Sheet 1 1 e5 l 3/ I l a P 5 6 34 J WZes'E W' il'iie,

Medan a739,

y )wdwmlm 013202 221 C. E. WHITE ET AL May 2, 1 950 RECEIVER FOR PNEUMATIC CARD STRIPPERS AND THE LIKE 4 Sheets-Sheet 2 Filed Jan. 31, 1948 12211882303 Maw Wed Whi e, y fiwwl Wiior negs May 2, 1950 c. E. WHITE ETAL ,8

RECEIVER FOR PNEUMATIC CARD STRIPPERS AND THE LIKE 4 Sheets-Sheet 3 Filed Jan. 31, 1948 llillllllatllfi n 1 5 1501 II. Wiaiifie,

viii/02 2242510 y 2,1950 c. E. WHITE ET AL 2,505,873

RECEIVER FOR PNEUMATIC CARD STRIPPERS AND THE LIKE Filed J51}. 31, 1948 4 Sheets-Sheet 4 Ciam iea ET Woaiie, Fwecl H. Wfil'i e,

fliiowney's Patented May 2, 1950 RECEIVER FOR: PNEUMATIC CARD STRIPPERS AND THE LIKE Gharles E. White, Abington, Mass., and Fred H. White Charlotte, N; C., assignors to Abington Textile Machinery Works; Abington, Mass, a trust of J Massachusetts Appliation January 31, 1948, Serial No. 5,554

(Cl. ISL-75') 15 Claims;

This invention relates to impro ements in receivers employed in a suctionsystem, for Stripping material accumulatedup'on' the; cylinder or cylinders of a carding machine or for cleaning other textile cleaning machinery, in which the fibres are separated in thereceivei from the dust and are available for use in the manufacture of textile material. p

More specifically the invention relates to receivers of the type having a verticalhermetically closed casing" divided into an upper fibre-collecting chamberhavirig a screen wall'or wall section and a lower dust-receivingchamber communicating with the fibre-collecting chamber through the screen and desirably having inthe dust-receiving chamber a filter through which suction is applied to maintain the desired degree of vacuum inthe dust-receiving and fibre-collecting chambers.

The fibre and dust-laden iris drawn by said suction into the fibre-collecting" chamber through a flexible conduit having a head or'lieads adapted" to be movably positioned in efiective'pr'oximity to the card cylinder or cylinders, 01'' to the nieh anism of other textile li'iahiiis So as to enable th e suction toremove the fibres and dust'a-ccuniulated thereon.

In usual machines;- of this type the wallet the fibre-collectingchamber and of the dust receiving chamber are respectively provided with doors which are hermetically sealed by suitable clamplng means which must be released to-permit the door to be openedarid the contents removed fron'i the res'pective'hambers' Inasmuch as" the-fibres accumulate rapidly in the fibre-collecting chamber it is necessary to open this door frequently; This necessitates the Where means are providedror actuating the" card stripping mechanism cdi'ltiliudusly to strip tiiecarding cylinders era carding machine in sue-- cessively repeated cycles theentire operation of the carding machine" be discfitifilid while the abrei's being remcvearrem'tne atre eoneeung chamber, thus greatly rec ting the or the esremg'msemne. 1

The general object a: e present invention is to provide means for avoiding the delays above described, and thereby to increase the efiiciency of the carding apparatus, the uniformity of the product, and the output of the machine, and alsoto eliminate the presence of an operator to manually remove the fibres in the fibre colle'cting chamber, thus materially reducing the cost of production.

One of the objects of the invention is to pro vide means for progressively delivering the-fibre from the fibre-collecting chamber without substantially varying the desired uniform degree of discharge conduit, leading from the fibre-collect ing chamber through and beyond a wall of the receiver, and having means therein for" progres sively forcing the fibres therethrough and having means for so resisting the delivery of the fibres" from the outlet end thereof as-to compact themsufiiciently to prevent the entrance of enough outside air at atmospheric pressure through them to substantially vary the desired uniform degree of partial vacuum maintained in said chambers.

maintained in the fibre-collecting and dust-re ceiving compartments.

These and other objects and features ofthe in Vention will appear more fully from the following description and the accompanying drawings and will be particularly pointed out in the claims;

Illustrative embodiments of the invention are shown in the drawings, in which:

Fig. 1 is a view, mainl in diametrical longitudi nal vertical section, of. a receiver embodying the invention; I

Fig. 2 is a vertical sectional view on a reduced scale on lines 2-2 Fig. 1;

Fig. 3 is a horizontal sectional view on lines 3 3 Fig. 1; p p s Fig: 4 is a diametrical vertical sectional; view of a receiver embodying a modified form of the invention; and,

Fig; 5 is an enlarged vertical sectional view onlin s 5+5 Fig; 4.

v The invention comprises broadly a vertical hermetically sealed casing having an upper fibre collecting chamber provided with a screen Wall or wall section and having therebeneath a downwardly converging bottom communicating with the tubular discharge conduit extending through a wall of the receiver and providing beneath said bottom a dust-receiving chamber, means for admitting the fibre and dust-laden air into the fire-collecting chamber, means for applying suction through the dust-receiving chamber, thence through the screen wall and the fibrecollecting chamber and a usual flexible conduit to a suction head which is adapted to be placed in proximity to the cylinder or cylinders of the carding machine to be stripped or in proximity to the mechanism upon which dust and fibre are to be re moved.

The receiver shown in Fig. 1 comprises a preferably vertical hermetically sealed casing i having a base 2 supported upon suitable columns 3 and a dome-shaped top 4 having a screen wall 5 hermetically clamped between the dome-shaped top'and the upper end of the vertical cylindrical wall I. The casing is divided by a suitable downwardly converging partition 6 communicating with a vertical discharge conduit i mounted upon the base 2 of the receiver and surrounding an outlet 8 in the base 2, thus dividing the receiver into upper fibre-collecting chamber 8 and a lower dust-receiving chamber In therebeneatn. The dust-receiving chamber preferably has suitably mounted therein a removable cylindrical filter i I one end of which communicates with a pipe l2 through which suction is continuously applied by usual air-exhausting mechanism which need not be shown.

As illustrated in Fig. 1 a pipe l3, which extends through the screen 5 at the upper end of the fibre-collecting chamber and through the dome 4, is connected by a suitable union i i to a usual flexible suction pipe !5 which is provided with a suction head adapted to be moved into proximity to the surface of the cylinder or cylinders of a carding machine or to other machinery, from which the dust or waste material accumu lating thereon is to be removed. The means for applying suction from the partial vacuum in the dust-receiving chamber through the fibre-collecting chamber to the suction pipe i5 as illustrated in Figs. 1 and 3 of the drawings comprises a pipe is leading vertically from the dustrecei ing chamber is to a horizontal section if. having unions is and I3 communicating respectively with vertical sections 28 and 2! which are mounted upon the dome 5 and communicate through apertures therein with the chamber of the receiver above the screen 5.

By reason of this construction the suction applied to the dust-receiving chamber produces a. partial vacuum in the casing above the screen 5 and through it in the fibre-collecting chamber and through the pipes i l and iii to the suction head thereon, thus causing the fibre and dustladen air to be drawn into the fibre-collecting chamber in which the fibre drops upon the inclined bottom 6 and descends by gravity toward and into the discharge conduit 1.

A vertical reciprocable plunger is mounted within the fibre-collecting chamber and it has a head extending into the discharge conduit which upon downward movement serves to force the material accumulating in the fibre-receiving chamber progressively through the conduit 1, and suitable means are provided at the outlet of the discharge conduit for so resisting the passage of fibre therethrough as to condense it 4 sufiiciently to prevent the entrance of enough outside air to substantially reduce the desired degree of uniform partial vacuum in the dustreceiving and fibre-collecting chambers.

The downwardly converging bottom of the fibre collecting chamber may be or any suitable character. As illustrated herein it converges toward the vertical wall of the casing preferably to a point beneath the doorway 22 where it communicates with the discharge conduit 1 as illustrated in Fig. 1 of the drawings. The plunger 23, which is mounted in bearings 24 and 25 in brackets 26 and 2; secured to the casing above and below the doorway, is provided with a suitable head 28 extending into the discharge conis secured at its upper and lower ends to the.

wall of the casing above and below the doorway, prevents fibres and dust from accumulating in the plunger and its operating means.

For convenience in assembling, the mechanism for actuating the plunger is mounted upon a door 3i which covers the doorway 22 and is normally permanently secured to the casing but,

adapted to be removed for the purpose of assemblage of the plunger with its reciprocating mechanism.

In the construction illustrated herein for actuating the plunger, the plunger is provided substantially centrally of its length with a horizontal slotted portion 32, Fig. 2, which is engaged by the arm 33 of a crank 34 the shaft 35 of which.

extends through a bearing 36 mounted centrally of the length-of the door 3! and through a hear ing 31 at the upper end of an arm 38 of a bracket 39 which is mounted upon the door 3 I.

Any suitable means may be provided for actuating the crank. As illustrated in Fig. 1 the shaft 35 is driven through suitable reducing gear train 40 from the shaft of a motor 4| which is mounted upon a horizontal base 42 integral with the bracket 39 and its arm 38. Suitable means are provided for resisting the passage of the fibres forced downwardly by the plunger 29' through the outlet thereof. As illustrated in Fig. l the means comprises a valve 43 which extends across the outlet 8 and is hingedly connected to a bracket i i mounted upon the casing at the lower end thereof. Suitable means are provided for so adjusting the valve 43 as to produce the desired resistance to the passage of the fibre through the discharge conduit 1 to condense the fibres in the conduit sufiiciently to prevent the; entrance of enough air through the fibres to sub-";

stantially vary the degree of vacuum maintained in the dust-receiving chamber by the suction pipe I5. As illustratedthe valve 43 is provided. with an arm 45 upon which a counterweight 46 is adjustably mounted.

It is obvious from 'the above description and illustration that byreason of the present construction the reciprocating plunger. will progressively condense and discharge the fibres which have accumulated in the:fibre-co1lecting chamber without the necessity of the attendance of amounts an operator to remove the fibresfi-om theiibre collecting chamberand will also enable the strip ping mechanism to be continuouslyoperated; Where a carding machine iswprovidedwith means for successively stripping the cylinders thereof in successive cycles a uniform lap of carded material will be continuously removed from the carding cylinder and continuously taliehby the receiver.- Hence the interruptions heretoforecaused by the shutting down of thesucti'on cyst tem during the stripping operation are eliminat ed and the efiiciency" and outputor the machine are greatly increased and the costof operation reduced. A

Another embodiment of the invcnt'ioneis ilius trated in Figs". 4 and 52 In. this construction the receiver comprises a casing: 411',- s'iinilar to that illustrated in Fig. 1 except that its" lower end is provided with an angle bar 48 which surrounds the lower end of the casing: and rests upon the floor and in thatthe bottom 19 or the casing is spaced from the floor. The upper end of the casing 41 is provided at its upper end with a dome so with a screen iclamped between it and the upper end ofthe casing 41; A conduit 52, similar to the conduit [3; extends centrally through the screen 5| and the dome 50 and is connected to a suctionpi'pe, similar to the fle'xible pipe 15, Fig. 1, and provides nieans-for trans mitting the fibre and dust-laden air from the usual suction head into the fibre-collecting chamber 53 as above described.

The fibre-collecting" chaniber in. the construction shown in: Fig. 4' comprises a: supplemental casing within and concentrically or the casing 41 having an upper section providedlwith a ver tical wall 54 and a downwardly converging wall section 55 which communicates atits lower" end with a horizontal cylindrical discharge: conduit 56 extending through and Well beyond the Wall 41 of the receiver. The space between. the walls of the supplemental casing: forming the fibre-collecting chamber and the walls 41 and 49 of the casing provides a lower: dustueceivina chamber 5'1. Ari annular passage 58' around the screen BS, or suitable apertures therethrough. establishes communication between the dustreceiving chamber 51 and the. s ace-betweenthe dome 5n and through the screen at with the fibre-collecting chamber; a cylindricalfilter 59', similartothe filter Iii shown. Fig; 1', is: pros vided in the lower: portion of the dustreceivirngi chamber and communicates at its end with a: fitting 6U which eatendsthrougri arid is mounted in: the wall 41 of the casing and has secured to it a suction pipe 6| which. leads to suction-producine means for maintaining a desiredconstant partial vacuum in the dust-receiving and: fibrecollecting chambers and in thefieiiible pipe leading tothe suction head; as above described. a helical propellingscr'ew" 62 extends longitudinally of and fitsthe cylindricaldlscharge conduit hav: ing ashaft 63 which is mountec in aliiled bearings 6e and 65 in" the end or the conduit 5c and upon the wall 41' oi the receiver and is provided with. suitable means for" rotating: the: screw in a direction to force the fibres des'o'fidi-llg from the? fibre-collecting chamber into the conduit;-

Means are provided for rotatin-gtheprcpcller screw shaft 63 which, as illustrated herein, coniprises a ulley u on the shaft 63 adapted to be driven by a power producingmeans. Any? suit able. means may be provided rouse: r inst the passage of the" fibres rorcedythrough the discharge conduit 55: by the propeller screw as to condense the! Sllffitii'e'titl? to prevent thea-admis sioh of enough air through thefibres to n'iatei ial'a- 1y vary the predetermined uniform degree of partial vacuum maintained in the dust-receiving chamber, the fibre-collectingchamber, andthe pipe through which the fibre and dust-laden;

air is drawn by suction into the fibre collectirig chamber.

As illustrated in Fig. 4 the propelling. screw terminates a suitable distance from the end of the discharge conduit 55 and a suitable adjustable valve ismounted upon the end of the conduit which, as illustrated herein, comprises a valve'fifi hinged upon the outlet end of the conduit arid provided with an arm 61 having thereon an ad justable counterweight cc' similar to the valve construction illustrated in Fig. 1 and operating in the manner heretofore described.

it will be: understood that the particular" e 'nib'odiments of the invention shown and described herein are or an illustrative character and that various changes: in construction and arrange merit of parts may be made within the spirit and scope of the following claims.-

Having thus described the invention. what claimed as new, and desired to be securedby Letters Patent, is:

1. Apparatus for progressively deliveringv fibrefrom a receiver; for a pneumatic cardstripper or the like, having a fibre-collecting chamber anda dust-receiving chamber having screened coiii munication therewith, means for admitting" fibre and dust-laden air into the fibre-collecting chamber, and means for exhausting air from the dust-receiving chamber to maintain asubstantially uniform degree of partial vacuum in said chambers, which apparatus comprises a tubular discharge conduit communicating withs'aid fibre collecting" chamber andhaving arestricted outlet and continuously operating means for compact iiig the fibre in said discharge conduit with force sufiicient so to condense the fibres therein as' to prevent entrance of enough air therethrough to reduce substantially the uniform degree of par tial vacuum maintained in said chambers.

2 Apparatus for progressively delivering fibre from a receiver, for a pneumatic-card stripper or the like, having a fibre-collecting chamberahd a, dust-receiving chamber having screened COIllmunicati'on therewith, means for admitting fibre and dust-laden air into the fibre-collecting chamber, and means for exhausting air from the dust-receiving chamber to maintain a substantially uniform degree of partial vacuum in' said chambers which apparatus comprises a "tubular discharge conduitcommunica'ting with said fibrecollectiiig chamber, continuously operating means for progressively forcing fibre from the fibrec'olIecting chamber through said discharge conduit, and a yieldable valve for the outlet end of said discharge conduit adapted to resist the pas sage of fibre therethrough so to condense the fibre therein as to revent entrance of enough air therethrough to reduce substantially the indi form degree of partial vacuum maintained said chambers.

3. Apparatus for progressively delivering fibre from a receiver, for apnulriatic' card stripper: or the =1il're; having a fibre-collecting chamber and a dust receivi-ng chamber having screened com munication therewith, means for admitting ilbr eanddust-laden air into: the: fibre-collecting chamber, and means for: exhausting air from the d'ustoseceivingf chamber to maintain a substan tially' uniform. degree or partial vacuum in:

chambers which apparatus comprises a tubular discharge conduit communicating with said fibrecollecting chamber, continuously operating means for progressively forcing fibre from the fibre-collecting chamber into said discharge conduit, and a yieldable valve for the outlet end of said discharge conduit, and means for varying the pressure exerted on said valve and to resist the passage of fibre sufiiciently so to condense it as to prevent the entrance of enough air therethrough to reduce substantially the uniform degree of partial vacuum maintained in said chambers.

4. Apparatus for progressively delivering fibre from a receiver, for a, pneumatic card stripper or the like, having a fibre-collecting chamber and a dust-receiving chamber having screened communication therewith, means for admitting fibre and dust-laden air into the fibre-collecting chamber, and means for exhausting air from the dust-receiving chamber to maintain a substantially uniform degree of partial vacuum in said.

chambers which apparatus comprises a tubular discharge conduit communicating with said fibrecollecting chamber, continuously operating means for progressively forcing fibre from the fibre-collectingchamber into said discharge conduit, a valve pivotally mounted on the outlet end of said conduit, and adjustable means for so varying the pressure applied thereto as to resist the passage of fibre therethrough sufficiently to condense the fibre to prevent entrance of enough air therethrough to reduce substantially the uniform degree of partial vacuum maintained in said chambers.

5. Apparatus for progressively delivering fibre from a receiver, for a pneumatic card stripper or the like, having a fibre-collecting chamber and a dust-receiving chamber having screened communication therewith, means for admitting fibre and dust-laden air into the fibre-collecting chamber, and means for exhausting air from the dust-receiving chamber to maintain a substantially uniform degree of partial vacuum in said chambers which apparatus comprises a tubular discharge conduit communicating with said fibrecollecting chamber, continuously operating means for progressively forcing fibre from the fibre-collecting chamber into said discharge conduit, a valve pivotally mounted on the outlet end of said conduit having an arm provided with a counterweight adjustably mounted thereon adapted to vary the pressure applied to said valve to resist the passage of fibre through said outlet with a force so to condense the fibres as to prevent entrance of enough air therethrough to reduce substantially the uniform degree of partial vacuum maintained in said chambers.

6. A receiver for the fibre and dust-laden air of a pneumatic stripper for a carding machine or the like comprising a vertical hermetically sealed casing having an upper fibre-collecting chamber provided with a screen wall and having therebeneath a downwardly converging bottom communicating with a tubular discharge conduit and providing below said bottom a dust-receiving chamber, means for admitting the fibre and dust-. laden air into said fibre-collecting chamber, means establishing communication between the dust-receiving chamber and the fibre-collecting chamber through said screen, means for applying suction to said dust-receiving chamber to maintainadesired substantially uniform degree of vacuum in said: chambers, continuously operating means for progressively forcing the fibres accumulating in said fibre-collecting chamber through said' tubular discharge conduit with sufllcient pressure so to condense the fibres as to prevent the entrance of enough air therethrough to substantially reduce the uniform degree of partial vacuum maintained in said chambers.

. 7. A receiver for the fibre and dust-laden air of a pneumatic stripper for a carding machine or the like comprising a vertical hermetically sealed casing having an upper fibre-collecting chamber provided with a screen wall and having therebeneath a downwardly converging bottom communicating with a tubular discharge conduit and providing below said bottom a dust-receiving chamber, means for admitting the fibre and dustladen air into said fibre-collecting chamber, means establishing communication between the dust-receiving chamber and the fibre-collecting chamber through said screen, a filter in said dustreceiving chamber, means-for applying suction through said filter to said dust-receiving chamber tomaintain a desired substantially uniform degree of vacuum in said chambers, continuously operating means for progressively forcing fibres accumulating in said fibre-collecting chamber through said tubular conduit, and adjustable means at the outlet end of said conduit acting so to resist passage of fibres forced therethrough as to condense them sufficiently to prevent admission through them of enough air to substantially reduce the uniform degree of vacuum maintained in said chambers.

8. A receiver for the fibre and dust-laden air of a pneumatic stripper for a carding machine or the like comprising a vertical hermetically sealed casing having an upper fibre-collecting chamber provided with a'screen wall and having therebeneath a downwardly converging bottom communicating with a tubular discharge conduit and providing below said bottom a dust-receiving chamber, means for admitting the'fibre and dustladen air into said fibre-collecting chamber, means establishing communication between the dust-receiving chamber and the fibre-collecting chamber through said screen, a filter in said dustreceiving chamber, means for applying suction through said filter to said dust-receiving chamber to maintain a desired substantially uniform de-- gree" of vacuum in said chambers, continuously operating means for progressively forcing fibres accumulating in said fibre-collecting chamber through said tubular conduit, a hinged valve at the outlet end of'said discharge conduit, and adjustable means for causing said valve so to resist the passage of fibres forced therethrough as to condense them sufiiciently to prevent admission through them 'of enough air to substantially reduce the uniform degree of vacuum maintained in said chambers.

9. A receiver for the fibre and dust-laden air of a pneumatic stripper for a carding machine or the like comprising a vertical hermetically sealed casing having an upper fibre-collecting chamber provided with a screen wall and having therebeneath a bottom converging downwardly and communicating with a vertical tubular discharge conduit and providing below said bottom a dust-receiving chamber, means for admitting fibre and dust-laden air to said fibre-collecting chamber, means establishing communication between the dust-receiving chamber and the fibrecollecting chamber through said screen, a filter in said dust-receiving chamber, means for applying suction through saidfilter to said dust-receive ing chamberto maintain a desired uniform degree of partial "vacuum in said chambers, a verresume eas ng the fi s accumulatingin the fibreollecting chamber and condensing themin the discharge conduit, means for reciprocating said plunger, and means at theoutlet of said conduit for so resisting the passage, of the fibres therethrough as to condense them s'ufiiciently to prevent admission through them of enough ;air to substantially reduce said uniform degree of tween the dust-receivingchamber and the fibre-,-

collecting chamber through said screen, a filter in said dust-receiving chamber, means for applying suction through said filter to -said dustsreceiving chamber to maintain a desired uniform degree of partial vacuum in said chambers, a;

vertical plunger recipracably mounted in said fibre-collecting chamber having a head provided with-downwardly and outwardly diverging prongs movable longitudinally of said tubular discharge conduit, capable upon downward movement of eificiently engaging the fibres accumulating in the fibre collecting chamber and condensing them in the discharge conduit, means for reciprocating said plunger, and an adjustable yieldable valve at the outlet of said conduit for so resisting the passage of the fibres therethrough as to condense them suificiently to prevent admission through them of enough air to substantially reduce said uniform degree of vacuum maintained in said chambers.

11. A receiver for the fibre and dust-laden air of a pneumatic stripper for a carding machine or the like comprising a vertical hermetically sealed casing having an upper fibre-collecting chamber provided with a screen wall, a door in said chamber below said screen wall, the said chamber having a bottom below said screen wall converging downwardly toward and below said door and communicating with a vertical tubular discharge conduit, a dust-receiving chamber below said bottom, means for admitting the fibre and dust-laden air to the fibre-collecting chamber, means for establishing communication between the dust-receiving chamber and the fibrecollecting chamber through said screen, a filter in said dust-receiving chamber, means for supplying suction through said filter to maintain a desired uniform degree of vacuum in said chambers, a vertical plunger reciprocably mounted on said door in the fibre-collecting chamber in axial alinement with said tubular discharge conduit having a head movable longitudinally of said discharge conduit capable upon downward movement of effectively engaging the fibre accumulating in the fibre-collecting chamber and condensing them in said discharge conduit, means for reciprocating said plunger, and an adjustably yieldable valve at the outlet of said conduit for so resisting the passage of the fibres therethrough as to condense them sufllciently to prevent ad- .10 mission through them of enough air to substantially reducesaid uniform degree of vacuum maintained in said chambers.

12. A receiver for the fibre anddust-laden air of a pneumatic stripper for a carding machine or the like comprising a vertical hermetically sealed casing having an upper fibre-collecting chamber provided with a screen wall, a door in said chamber below said screen wall, the said chamberhaving a bottom below saidscreen wall converging downwardly toward and below said door and communicating with a vertical tubular discharge conduit, a dust-receiving chamber below said bottom, means for admitting the fibre anddust-laden air to the fibre-collecting cham ber, means for establishing communication between the dust-receiving, chamber and the: fibrecollecting chamber through said screen, a filterin said ,dustereceiving chamber, means for supplying suction through said filter to aintain a desired uniform degree of vacuumin said chambers,

a vertical plunger reciprocably mounted on said door in the fibre-collecting chamber in axial alinement with said tubular discharge conduit having ahead movable longitudinally of said discharge conduit capable upon downward movement of effectively engaging the fibre accumulating in the fibre-collecting chamber and condensing them in-said dischargeconduit, -:means including an electric motor mounted on said door, for reciprocating said plunger, a counterweighted valve hingedly mounted upon the outlet of said conduit, and means 'for adjusting said counterweight to cause said valve so to resist the passage of fibres therethrough as to condense them suificiently to prevent admission through them of enough air to substantially reduce said uniform degree of vacuum maintained in said chambers.

13. A receiver for the fibre and dust-laden air of a pneumatic stripper for a carding machine or the like comprising a vertical hermetically sealed casing having an upper fibre-collecting chamber provided with a screen wall and having therebeneath a bottom converging downwardly and communicating with an horizontal tubular discharge conduit extending through the wall of said casing, and provided below said bottom and discharge conduit with a dust-receiving chamber, means for admitting the fibre and dustladen air into said fibre-collecting chamber, means for establishing communications between said dust-receiving chamber and said fibre-collecting chamber through said screen, means for applying suction to said dust-receiving chamber to maintain a desired uniform degree of partial vacuum in said chambers, means for continuously and progressively forcing the fibres accumulating in said fibre-collecting chamber through said discharge conduit, and a yieldable valve at the outlet end of said discharge conduit for so resisting the passage of the fibres therethrough as to condense them sufiiciently to prevent admission of enough air therethrough to substantially reduce the uniform degree of partial vacuum maintained in said chambers.

14. A receiver for the fibre and dust-laden air of a pneumatic stripper for a carding machine or the like comprising a vertical hermetically sealed casing having an upper fibre-collecting chamber provided with a, screen wall and having therebeneath a bottom converging downwardly and communicating with an horizontal tubular discharge conduit extending through the wall of said casing and provided below said bottom and discharge conduit with a dust-receiving chamber,

a filter in said dust-receiving chamber, means for admitting the fibre and dust-laden air into said fibre-collecting chamber, means for establishing communication between said dust receiving chamber and said fibre collecting chamber through said screen, means for applying suction to said dust-receiving chamber through said filter to maintain a desired uniform degree of partial vacuum in said chambers, a. screw propeller fitting said discharge conduit, and means for rotating said screw propeller continuously and progressively to force the fibres accumulating in said fibre-collecting chamber through said discharge conduit, and an adjustable yieldable valve mounted upon the outlet end of said discharge conduit for so resisting the passage of the fibres there- 9 through as to condense them sufliciently to permit admission of enough air therethrough to substantially reduce the uniform degree of partial vacuum maintained in said chambers.

15. A receiver for the fibre and dust-laden air of a pneumatic stripper for a carding machine screen, means for applying'suction to said dustreceiving chamber through said filter to maintain a desired uniform degree of partial vacuum in said chambers, a screw propeller fitting said discharge conduit, means for rotating said screw propeller continuously and progressively to force the fibres accumulating in said fibre-collecting chamber through said discharge conduit, a valve pivotally mounted upon the outlet end of said conduit having an arm extending outwardly therefrom, and a counterweight adjustably mounted on said arm adapted to cause said valve so to resist the passage of fibres through said conduit as to condense them sufiiciently to permit admission of enough air therethrough to substantially reduce the uniform degree of partial vacuum maintained in said chambers.

CHARLES E. WHITE.

FRED H. WHITE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,635,834 Goldsmith July 12, 1927 1,703,503 Thurman Feb. 26, 1929 2,253,698 Goldsmith Aug. 26, 1941 FOREIGN PATENTS Number Country Date 16,300 Great Britain of 1910 

